Go for a Camaro over a Corvette unless you want to make room for a torque tube and a transaxle. The engine/clutch/transmission should all be available from a Camaro as one package. The LT1 from the newer Camaro has VVT, direct injection, higher compression, etc (see below). That would probably be better. If you think you can piece it all together for cheaper or want more discplacement or something new or something built then the options are vast. GM crate motors for a LSX can be built to your own spec, and you can buy a T56 Magnum for a more custom position with the shifter.
https://philkotse.com/car-maintenanc...fferences-9670
https://www.ebay.com/itm/30486564272...RoCAusQAvD_BwE
https://www.ebay.com/itm/29557763242...RoCQUwQAvD_BwE