75-76 Aluminum 833 4 speed Overdrive trans questions ?

I'm happy the a very mild 68 273 will have fire thru it after all these years. My plans are to heavily research and call cam companies to grind a cam that maches the Edelbrock Street master intake which has great tork but is all done at 4500. might cut the stock heads to 9:5 1, etc
I have found propane carburetors that will work. I don't give a damn what the fuel situation is, I'm going to cruise !!!