it will fit. you will have to use camaro frame mounts.
Yes it is, the nova is also useable in the camaro or firebird,I put a 73 nova subframe under my 68 camaro.
NO!
Yes.
No
Yes it will fit, They are exactly the same body style
Yes it should.
Yes
I would assume so. I have a Chevy 454 in my 68 GTO, and it fits fine. I just used chevelle Motor Mounts. Bolted right to the a-body frame. However my hood on the 68 might have more room from the ram air set up.
Some parts will fit, depends specifically on what parts you're referring to
68 Camero or some dual fuel setups, IE TBI 454
will a mid 80s 305v8 fit in a 1993 firebird that had a lt1 in it