If you live in the GTA,try National Moparts in Beaverton. http://www.nationalmoparts.com/
The distributors are specific to the 400 and 440 respectively. (one is longer than the other.) Oil pan is car specific as well. You are welcome to join my homepage as there are many experienced Mopar nuts over there--including myself,LOL http://www.moparfins.com/forum/default.asp
There is a classified section on this big mopar forum here; http://board.moparts.org/ubbthreads/myhome.php?Cat=0
Be prepared to pay a premium for the dual quad intake and adjustable rockers. Mopar parts are expensive engines to build compared to SBC and Poncho motors..
Mopars and Pontiacs are what I grew up with and I equally love them both.
-- Edited by La_Wrench_n on Monday 8th of November 2010 08:47:04 PM
Oil pans are not specific to B/RB as far as I know. I have swapped pans before between B's and RB's without an issue.
I know nigel at national moparts and hes usually my last resort as he is pretty pricey. I browse moparts but I don't usually talk to anyone. They get pretty pissy unless you are doing a concours resto half the time.
I picked up a 57' Plymouth. Someone swapped in a SBC and I would like to go back to a mopar big block. 58-59 engine mounts make it a bolt in. I still have lots of mopar parts left over, including a couple of siezed up motors (400 and 440), 4 brl intakes, etc.