I have had decent luck with Mallory distributors. Summit has that distributor on clearance for $179. http://www.summitracing.com/parts/ma...merican-motors.
Here is another cheaper option: https://www.pricefalls.com/product/a...FdgPgQod4fULVA
That was a quick search. You may find it cheaper. I know of a few people running ProComp distributors with a MSD 6AL and have had no problems. It is chinese made but a lot of the aftermarket parts are anyway.

Just another option to weigh out.

Brian