You're gonna have to forgive me in advance. But with the one new guy only having 500.00 to fix his car, and wanting to do an engine swap, and the other guy having supposedly 15k to spend, but refusing to heed a single piece of advice he was offered....
I'm a little skeptical.
So then...
While there are plenty of guys here that know all about the factory equipped fuel injection, rarely will it be adequate after you start throwing an aftermarket engine build together. And once a forced induction power adder enters the picture, it isn't up to the task.
That said, you have to decide whether or not the engine is going to have a power adder, and make that choice first I'd imagine.
Everything else you buy for the engine will revolve around that including the fuel delivery system, and the ECU that'll manage it.
I don't know where you got your initial info from regarding using a maxed out bore, and a smaller stroke crank to yield a 347 displacement, but I'd think that a 347, done the way it usually is done, ( 4.030 bore/3.4" stroke instead of a 4.125 bore/3.25 stroke) will yield more torque, and not be a block killer should something fail. Once the engine is bored 4.125, a part failure that damages the cylinder wall finish forces you to sleeve the cylinder to save the engine.
But again, whichever way you go, the one version will make decidedly more compression than the other will. The long stroke engine with the same flattop piston design as the shorter stroke version will have a higher CR when using the same head.
All of which will be very important when/if you decide to force air into the engine.
You'll have to know if you intend to use a Trickflow head. The offset valve angle in that head will affect your piston choices.
If you have 20k plus to build all of this, that should do...but at the same time I'm wondering why anybody puts a race engine in a vert. A Convertible is the worst platform for any drag, or road race platform.
That car you pictured is obviously dead stock, right down to the 10 hole wheels...why are you just now deciding to dump money in it? Did you just buy it?
With 20 k to spend, there are so many cars out there that have twice that or more invested in them that can be bought for less than you'll ever be able to build it for.
I always wonder why a person would even start down the path. ( dropping a wad of money all at once on a build) It's a very different thing if the car just gradually evolves into a 20 k investment over multiple years, but if you have a whole bunch of money just laying around on your coffee table, the "best deal ever" is just a few clicks away.
And bought for 20 k or less.........Most of the time, way less.
If somebody walked up to me with 20 k and offered to buy the monster, I'd probably even let him go.....And that lucky person would have a car that couldn't be built for twice that.
* And.....its "Tremec"
And " brakes"