Well first we would need to know what compression and heads you have and what you want it to be. Camshaft information would help also. Just because you have an older car, you might not even have to run 91.
Its not the alt. you know that little metal box on the firewall? The not the ecu but the ballast? I replaced that and fixed it all! I had the same issue, try it only like 20 dollars
YUP RHS head with 34 total timing, DC3 the guy with a green cuda is also running 87-89 with iron but magnum heads so might have something to do with it.
i just turned 20...and was 19 in july...my motor is upgraded fully and ive been all of this asking question stuff. I only post info that i have read off of here...Listen to the people on here they know what they are talking about.
im running straight 30wt i dont understand, why you need 20-50 for higher HP cars? I thought it mattered about the clearances and what oil pressure you get...?? and I only run Vr1 by its self, it says it has ZDDP in it so why need anything else??