I just had my original 340 rebuilt for my 69 swinger.Its 30 over with forged pistons new eagle rods,comp cam with 460/470 lift, original X heads redone,balanced all new arp bolts.I have the original exhaust manifolds and have an ld 340 intake.727 auto reworked with shiftkit. If I was going to put on a new intake what is the best one for a basically stock engine. I was told the ld 340 is old technology, and am considering either a edelbrock performer or air gap?Am I wasting my money or will I notice a difference. Any advice would be appreciated.