A buddy of mine with a '91 GT is getting ready to order a TB and unequal length shorty headers. His ride has all the usual bolt-ons (pulleys, cat-back, off-road h-pipe, MSD, Edelbrock Performer, 3.55s) but doesn't plan on installing heads anytime soon (he just installed a new stock long-block). He wants a 70mm TB and 1 5/8 headers but I caution him it might hurt his mid-range torque output. Would a 65mm TB and 1 1/2 headers better suit him? If he does get heads (the stockers being true major restriction in the package) will these smaller pieces still support descent power or would they become a restriction at that point? Thanks.