I have done this swap previously and currently doing it again into my '84 camaro. The GN heads will fit without the ac, some mods to the downpipe will be needed, but nothing extreme. I used the 700r4 trans that was in the car using an adaptor plate. That way I didnt need any custom cross members or torque arm. If the TTA is carbed, new fuel lines and in tank pump would be the easiest. The GN wiring harness will need to be modified to work with the TTA. That price seems pretty fair for such a low miler car. I paid $5000 CND two years ago for my 84 with 150000km. Good luck and you can check out my swap on Thirdgen.org, under the same user name.