SBC long tube headers

looking to try out fitting some SBC headers on the track car build and want to see what im working with for steering and motor mount clearances.

i just need a set to mock up to see if i can buy a set of camaro, chevelle, chevy II headers etc and get away with modifying only one tube or if ill need a whole bunch of work done.

looks like the following will work, year descriptions may be a year or two off from when the design changed
62-68 Chevy II headers
68-72 chevelle headers
any camaro headers look like they may work

just looking to see if anyone has some laying around i could borrow for a day or two.

thanks,
Mike