I just picked up a 60-63 style Flowkooler water pump, $35 Robertshaw 180 deg t-stat, a Champion 3-row, and their aluminum surge tank for my 63.5 390. I am thinking about ordering a BT 427MR 4V intake for it. It sounds like I will need to exchange the t-stat for a different vehicle / size? Whats this about being able to use the larger stock size?