[Ramairnacho]

I have a 1970 ra3 formula who with #13 heads that has been rebuilt stock about 30 years ago and engine never started. I need To go through it again. It bored .20 over stock. The heads aren't correct but I had them rebuild harden seats and slightly bigger value openings too. It's all new springs stainless ect.i bought a set of number 12 date coded for car and thinking of running those. If I decide to do that will I need dish pistons, thinking of new rods too because stocks probably need arp bolts pressed in. My harmonic balancer probably old too. Is roller cam actually worth the extra cash and is it efficient and reliable? I have no plans on racing my car. It's a stock build with stock carb. And will have rebuilt transmission. I do want about 400 hp. Which I think I got with these #13 worked heads but not sure. I also want to do a stock transmission rebuild transmission code is pq and them add a road race posi unit and go from 331 to 307 or 273. I think 273 will be more freeway friendly but I don't know. Need some modern knowledge. I'm not building a race car basically a stock built. Advise please .