Custom welded subframes is the only way to go. That took care of all the problems i had on my conv. If you can have your subframes also tie into the jack rails, this will also help stiffen up the body.
i wouldn't get a centerforce. I had the worst luck with that clutch. Didn't even last me a year. I personally like the spec, i think it has good pedel feel.
I didn't like to tokico's i had a problem with them leaking with less then a year of use. If your looking for a good performance shock, go with the koni red. Or if your will to spend the money get the koni adjustables, that way you set them how ever you like.
Send you heads and intake off to be ported at the same time before you put them on your car because you'll end up wanting to do this eventually. Having the two ported at the same time also allow the machinest to port match which will get you a couple more hp. I also agree with a f303 cam and...
I currently have a GT40 intake with the lower ported and polished with the upper port matched. Been thinking about switching to the spyder, and i just wanted to know if anyone knows much about this intake.
Swapping trans, costs money and time. Just be ready to spend some money. I've swapped the t-5 in my car for a d&d viper t-56 and that was a straight across manual trans swap, there are alot of parts to change out.