Years ago when I had a 500 caddy engine and was thinking of using it in my pickup,I googled several websites looking for photos of how others made the engine mounts,etc---found one that showed a engine using nothing more than a hunk of 1/2" thick steel bolted to the trucks original frame engine mount location and they used stock Eldorodo engine mounts bolted to the steel plate--basically the caddy's engine block has 2 holes casted right thru the block further forward than a chevy engine,so all you need is the steel to bridge the gap between the two........................................................................................................................I think the site I saw was "Chevrollac" or something similar,a guy was installing a 500 into a 2wd pickup truck...looked almost too easy!..the other sites like 500 cid.com have ready made mounts too I saw...I didn't have much luck finding a rear sump eldorado oil pan,so I ended up selling the engine I had back to the guy I got it from,after letting it sit in my shed 10 years....