If its a daily driver, stay with the stock flywheel IMO. Adding cubes is ALWAYS a good thing. A good rule of thumb is 1 HP per cubic inch. Sure you can exceed that, but it s good rule of thumb so you don't expect too much. The 331 will give you more low and mid range torque which is IDEAL for the street too. I'd go 331 if I were you and planning a rebuild. I have to rebuild my stang, but I will NOT be stroking it, at least I don't think so. The reason being a stroker will take my maximized combo and make it restrictive, plus I want to see how fast a 302/306 can go in one of our cars, namely my vert. If I didn't already have my cam, heads, and intake I'd do a 347 and be done with it though.