I think something got missed. Mudmax are you still going to put a 5M-GE motor in your runner. If so your only bolt on options for trannies are the G or W series. The 5M bellhousing you have will bolt on directly. To use an R series tranny, you can get a 7M-GTE Supra Turbo  R154 bellhousing. Which will bolt to your tranny and to a 5M motor but the input shaft is too short and you must use the Supra Turbo clutch assembly. The  R151F bellhousing wil not bolt to an 5M or 7M block . The starter is on the opposite side. Here are a couple of threads I started before.

http://board.marlincrawler.com/index.php?board=14;action=display;threadid=1062

http://board.marlincrawler.com/index.php?board=12;action=display;threadid=768