5.3 in my 1990 RCSB motor mounts

[RedHeartbeat]

I use the 6 hole units on my conversions, more room at the back of the engine plus it fits the fbody alternator better.

[scarbrow]

I use the 6 hole units on my conversions, more room at the back of the engine plus it fits the fbody alternator better.

so it used the stock tranny crossmember bolt location?

[RedHeartbeat]

Drill new bolt holes in the frame if they dont align, its not tough. I believe they do line up of you work with it. I built a whole new crossmember to clear my headers, convert to the 80e transmission and clear true dual pipes holding the pipe way up high.