you can nail vomit to the wall... you have to let it dry in the sun until its baked hard and then scrape it off with a sharp spatula as one piece and thats it.
There are ways to get power out of an NA engine, but only if you have deep pockets.
A good early GC8 half cut should cost around $3500. Leave around $2K for install of engine and wiring. Zero if you know how to do it yourself. And thats it!