What wouldn't be an insulting offer?

If the newer engine/trans is from an rv, the trans isn't worth anything. So, you would just be buying the engine. Something to consider when making an offer. The later engine should have a cast crank. Don't worry about strength. I've had one in my Sport Fury for 15 years, and it runs low 12s. The balancer is different from the earlier engine, can't just go out and buy an sfi balancer for it.