I have a 71 429 bored over .040, cyl head valve ports hogged out to 2.25 intake and 1.65 exhaust, not alot of room left, if you do the math. i decided on the Crane part # 354551. Accompanied with the Weiand Stealth intake, 750 cfm Holley MANUAL secondaries, ( I dont like the vacuum because of the delay ) MSD Dist. cause you can tailor the advance curve, and I found the most aggressive advance curve to be the most responsive combination with the intake system. Kept the 10.5:1 compression with forged pistons and I had to use comp lifters due to the fact Crane didn't offer any lifters for that cam at the time. B&M built C-6 , 9" Ford nodular, 3.50:1 rear end , 2500 stall TCI converter, All stuffed into a 69 Fairlane 2 door. Apprx 438 ft lbs. of torque and 443 h.p. @ 5200 rpm. This of course was ten years ago with the resources I had then. I still love the engine combination, and can run 93 octane all day long. I also have access to 110 octane where I live, but I don't need it.