My first time out. what next?

Thanks guys. I am looking into getting a converter built by Dominator here in Australia. will also proceed with cutout plates behind the collectors and then a twin 2.5" system for the street.

If funds permit, I'm going to get a drag rear end put together with 27 inch drag radials.
I'd like to go 4.3 ratio but i 4.11 is the shortest I've heard of. 4.11 with a 27 inch tire would be mathematically the same as the current 3.7 with 25 and a few more rpm over the line wouldn't hurt, though it was fairly spinning from memory. I don't want to do a conversion to a different model diff because that would make swapping diffs 10x more work. It will have to be the same type of housing with different internals.

I'm going to hold off on swapping carburetor and fiberglass hood/bumpers etc until I've at least gotten the new converter and exhaust. thanks for all your help guys!