I have 11 pairs (one complete engine set plus 3 spare pairs) of new Mopar Performance solid roller lifters for small block Mopar race blocks still in their packages. I took one pair to photograph. Part number is P5249584. See the included picture from the 1997 Mopar Performance catalogue for the...
Something like this
https://www.summitracing.com/parts/pro-66843?seid=srese1&ppckw=pmax-tools&gclid=EAIaIQobChMIx6fCq6C0hQMVk5paBR0TnwsoEAQYAyABEgIJXvD_BwE
My vote is for the Indy.
I was considering running a set of W5’s. I was working with Ryan at Shady Dell. He preferred the Indy versus the large port M1 based on his experience with these two manifolds.
If you measure the journal diameter across the opening and get the following approximate numbers you will know whether it is a 360 or 273/318/340 journal size cap.
~ 2 5/8” = 273/318/340 journal size
~ 2 7/8” = 360 journal size
The W3 if I recall correctly was a big block head with W2 style ports. Experimental only from what I have read.
Looking forward to seeing the results of the W5’s. Great looking setup and attention to detail.