For a low-boost application in a truck I think either one on paper will be too similar to make a difference.

I would do a leakdown check and use whichever one seals better. Oil leakage into the combustion chamber leads to detonation.

OTH, I read somewhere that everyone destroys their first home-built turbo, so use whichever engine you like least.

Parts I seek: driver doorpanel, 65 Sport Fury, prefer black, needs to be 7-8 on 10 scale, might buy set 16" x 6" Dodge truck wheel(s), from early 70s?, takes 9" dogdish - need for a research job so cheaper is better. 69-73 C-body caliper brackets and/or splashields Send a PM.