[TransAm 474]

I would say, for your engine, a good 10w40 would work great, such as the Valvoline VR1 .... and for those that have a Flat Tappet camshaft, we also use, and have had great results with the high zinc 10w40 Lucas Classic Hot Rod oil.... anything with .0032" + bearing clearance on Mains and Rods we like a good 20w50 oil .... on our Procharger/Methanol drag race stuff with .0035" bearing clearance, we sometimes use a good straight SAE50 weight ... but we also like an excellent 20w50 race oil in that application as well, such as Brad Penn(now PennGrade)