Latest update: I have my 383 installed and the exhaust is in place. I'm running Flowmaster Super 44s. These mufflers sound AWESOME! Loud and aggressive! With current tuning the motor has has been started 10 times. The last 4 or so times it ran no less than 20 minutes. The aluminum radiator and electric fan keep temp under 170. I took it down the street a couple times, stopped and hit the gas nice and firm. Oh my! Promptly lit up the tires and put a huge smile on my face! I'm sure my 700r4 w/3k stall and 373 gears had a lot to do with it. I'll wait till I get more miles on it before doing too much.
I do have a question for you BP owners. I can't seem to get the shake out of the motor at idle. Take a look at this video. Watch the air cleaner shake side to side. Is this the cam or does the carb need tuning?? It sounds great and has plenty power so I'd be suprised if it's out of tune.