Thanks Pat! yes the HP/TQ should be around 450/470 or so. I'm guessing at this because he has the heads/cam/carb/ignition/comp, etc that I had in the 413 sm. block that I had in my '32 {he bought my parts, just used his own 383 block, crank, rods, pistons.}. So basicly the same motor just 30 less cube's. My 413 was 460/499 Hp/Tq.... I've checked headers for him & the only company I've found so far that makes them for the AFR angle plug heads is Stahl & there $1020-1070.... But like you said he needs the 1 3/4" tubes but as of now the money is holding him back. First thing will be to try the Accel 'shorty' plugs just to get the car running. From what I found out he needs plug #416S.... Thanks again Pat... Bill