Hi guys, relative newcomer here & I am doing some some long awaited upgrades to my 68 custom convertible . I am losing the 2.56 peg leg in favor a 3.08 posi(8.2 chevy) and retiring the ST 300 in favor of a TH 350 with a shift kit & a slightly looser converter. These 2 upgrades should add a little more zip to the step. M questions are 1) do I need to change my crossmember ? 2) Any ideas on how to swap linkage from my 2 spd to a 3 spd ? 3) Do my tranny coolant lines need to be swapped as I was told the different trannys flow is opposite ? Thanks in advance for your help