Engine placement

Just wondering if a 427 or 454 will fit in place of a 305. I have an 80 elcamino, just wondering how much work it was to put one in.

i saw a 454 in a 5th gen last night, it was my instructors. not sure how much work is involved. it looked pretty tight but i didnt see anything custom.
i'm also looking into a manual conversion for my 79 so ill keep you updated

I would appriaciate any info you have or find out. When i do put an engine in i will also be swapping the tranny for a 4 or 5 speed. thank you very much

It'll probably be a tight fit with headers, but ive seen someone squeez a 396 into a miata befor... so after that i think pretty much anythings possible.