You can solve all your distributor problems by useing a front distributor drive, and go as big as you want too on the blower. I've got a 1471 on a sm/blk with a buzzard catcher, pushed 35 lbs boost with a 355" motor, at 20% overdrive. I use an 8MM 3" drive setup and a front crank support. I drive the distributor and the Enderle 110 pump with the cover. Good viberations has so good prices on blower, and sell the RCD crank support which you will need if you go with a high output blower. That or have a crank with a B/BLK snout. Jim is a pretty good person to deal with. I use Mert Littlefield for my blower service, and have for over 25 yrs. The front distributor/pump drive is about $1100.00 but once you have it all your probled are solved for any blower combination. I use a 6" extention to drive the pump.
Below is Summers Bros. web page and it shows the parts and #'s.
JMO
Zip.
http://www.summersbrothersracing.com...r%20drives.htm