Need forsight from the competitive guys...

[Xplosiv]

Me and my dad are planning on building a road race/street car. I use the term street car loosely lol. Basically as long as its got lights and we can tag its a street car. We are planning on using a lot of parts we already have from our cars over the years including his 1969 camaro z28 restoration. I have a 350ci out of a 69 camaro rs/ss and an m21 4 speed ready for the next project. I also have a 700r4 and a 355ci tuned port motor out of a 92 z28 that I could use. I need some input from the guys who actually compete with their cars whether it be recreationally or sanctioned. The platform we have in mind is a 70-73 camaro or firebird. My questions start with which would be the better motor trans setup to go with? Will the 4 speed manual be sufficient with the right gearing or would it be worth the coin to find a 5 speed or a t56? Whats the prime things to start with on the suspension? Wed like to use a built chevy 10 bolt with around a 3.23-3.42 gearset. A 12 bolt might be a good idea? The car is going to get driven, and its going to get abused. There wont be alot going into it as far as paint or body work. It'll get all the bodywork straightened out and fitted. Then a coat of solid red paint. Any and all advice that can be given is appreciated. We never owned a racer before.