don't know about the mounts....you'd have to look at an "la" 3.9 and a magnum one...maybe the LA has the ears, since they were put in full size trucks and vans starting in '88 (last year of the slanty is '87), and I'd find it odd that they wouldn't use common mounts for the V6 and V8....

rods? why custom? they're the same as 318 rods?

cam- hughes sells 3.9 cams, or get the stock roller reground......intake, you'd be limited to a stock LA 3.9 2bbl, one of the unobtanium MP 4bbl, or go EFI with a stocker.