For the West Coast Historic Trans-Am group, you are not allowed to run your Camaro with aluminum heads nor angle plug heads. Even though dry sump oiling was allowed by SCCA beginning with the '71 season, the Historic T/A group does not allow it on a Chevrolet. I have seen them allow AMC engines to run dry sump systems but they feel the AMC stuff is hard to get and that those engines would be more hard pressed to survive whereas a Chevrolet wet sump system, especially with an Aviaid pan, is up to the task. There is no issue with running a 9" in your '70 Camaro as that was allowed beginning in the '70 season. My understanding is you can run a longer rod if you want but you need to be running a 305" engine. This all pertains to cars with authentic Trans-Am race history running in the Historic Trans-Am group. If your car does not have that sort of race history and you are not running in the HTA group, then there may be some other criteria that is allowable or that you have to meet.