Well, not sure on everything because this was some one elses project that I took over but here's what I know.

1978 K5 Blazer, stock rear end (not sure what gear), 32" tires, HT350 trans freshly rebuilt but dont know what converter was used (probably stock stall), 4772 Holley double pumper, vacuum dist, and yes it is plugged to the carbs vac advance port. No vacuum leaks.

I also think my oil is a little too thin, lol. I drained it and used some from the shops pump but I did know they changed it to 0w30. It ran good till it got good and hot and lost power and I noticed that the oil pressure at idle dropped to 5 psi. All the main clearances were right on specs. What do you think of running 20w50, or 40 or 50 weight racing oil? When I had 10w30 in it psi was good but still got down to about 20psi after warm up