So I installed the engine today using my Holley motor mounts and stock 4th gen clamshells. Everything fit into the car but I have two issues.

The engine sits higher on the passenger side and the the 302-2 oil pan is sitting on the k-member on the side as well. I think the reason it is sitting higher is because it is sitting on the pan.

I know some people have installed the clamshells upside down but I don't think this is possible with 4th gen OEM mounts.

Has anyone had an issue Holley motor mounts, Stock k-member, and Stock OEM 4th gen clamshells? I assume I could just shim the engine on the side so it won't hit.

 

Actually looks like it is hitting just a bit on both sides. Maybe these mounts are worn out?

 

I don't have experience with holley mounts, but I do with the old Hawks/Spohn LS swap brackets. Their PS mount was fabricated too low. A level across the radiator support vs valley cover supported this. My solution was to cut/weld, but that's not always an option for everyone
Fbody LS1 mounts can be installed upside down/backwards. For new mounts, it shouldn't affect geometry as the thru bolt is centered in all axis'. Old mounts can sag more/less which can magnify mount irregularities

An alternative is to use the old SBC clamshells with simple adapter brackets. ICT/amazon knockoffs or whatever all work well. Be careful as the clamshells are side specific and can be installed backwards

 

I have brand new mounts coming in a day or so. The pan hits the k-member where you see that first circle by the brake line. Also, I’ve highlighted the tang? on the motor mount. If it were upside down it would not go in the mount at all?!?! Once I get the new mounts I’m going to attach everything loosely, lift the engine and then tighten everything up. Hopefully there is enough room after that. If not, I’ll get a little more aggressive.