New Motor In and Running!!

Just got the rebuilt 318 put back into my 73 Duster. I broke in the cam and all already and took it over last evening to connect the headers to the rest of the 2.5" Flowmaster exhaust. It sounds awesome! The XE268 cam gives it a nice lope, perfect for me and just what I was looking for. Haven't drove it much, just last night to the gas station after I changed the oil again and refilled with Rotella 15w40 and a bottle of EOS. Still have some tuning to do, as it seems more timing sensitive than ever before. With this stock converter and 2.76 gear, it still gets out of the box fairly well, but I haven't really romped on it yet, as it gets up to speed ok, but when you come to a stop, the engine decreased dramatically to 400-500 RPM like it wants to die, but I tap the throttle and it comes back to a closer to normal idle speed. Is this due to the decrease in vacuum( since I run vaccuum brakes and power steering), or is it still timing related and needs more adjustment? How many degrees after zero should I set it at on the dampner at idle? It seems to hesitate a little on acceleration still, and occasionally pops back through the carb and it may die if it does it at lower RPMs. I just need to determine if its a byproduct of less vaccuum, or still semi retarded timing. If anyone has suggestions and/or a timing reading on the dampner at idle to compare, I would appreciate it. Otherwise, the motor sound awesome and I cannot wait to get back to the cruise night this weekend.:toothy10: