ahhhh... dude!
I have a 75mm maf, 70mm tb, and a cobra intake on my blown 331. Its plenty fast. if you're going na a 65 tb will be fine and will match the cobra intake.
The 73mm will be fine... and when your ready to upgrade to 30# injectors I have a tube I never used and will sell you....
My opinion... start with the maf. The stock unit is 55mm.
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Rick
My 89lx(updated 11/5/2000)
My 97 Cobra