[robdrobd]

I was wondering if this was possible without much alteration.

 

[66Sprint]

Re: Can I get a CB450 from the 80's into a cb450 from the 70

I assume you mean an engine swap.... I believe anything's possible, but motor mounts, and wiring changes would be in order at the very least assuming the "block' would nestle in the early 450 frame (which I doubt).....
Trial fit one and we'll all know for sure ... It is an interesting idea.....