Big Block Tilting Toward Firewall

[Sixball]

I posted this in the 88-98 Section, but this isn't really year specific, so I thought I'd post here as well. I took the SBC 350 out of my 94 1/2 Ton Sierra and dropped in a 1970's BBC 454

I noticed when installing a Dual Quad tunnel Ram, that my engine tilts toward the Firewall - the carbs will not be level at all. I haven't been under the Truck in a while to check the pinion angle, but I need the engine to tilt forward quite a bit to get the engine level. I used the original motor mounts (Small Block) when I installed the 454. I believe those are taller? I had a hard time finding a Tranny mount for the Turbo 400, I remember going back to the Parts Counter several times.

Will changing the SBC motor Mounts to BBC Motor Mounts tilt this forward? Or do I just need a different Tranny mount? I just noticed this last night and haven't had a chance to crawl under the Truck. Brainstorming ideas as to how this happened and how I can correct it.