Trimming/knotch the frame

[Richie209]

Do I absolutely have to trim the frame if I want to run the low mount A/C pump? I'm doing a frame off resto on a 70 short bed I plan to put an Vette LS2 in it and I wanna run the low mount AC I really don't want to trim the frame but if I have no other option I will.. What parts would I need to buy to run the low mount AC with out having to trim the frame.. I've searched and searched the fourm but I could never find a straight answer. And if there's no other option but to trim the frame where and what part do I trim? http://67-72chevytrucks.com/vboard/a...1&d=1429989990 http://67-72chevytrucks.com/vboard/a...1&d=1429990326