Beat on the old 352 in my 65 F-250 today for a mile or so. Decent pull from about 68 to about 105 mph. Stock 3.5" stroke, 4.000" bore, early 66 390GT/428 camshaft, C0AE-D heads, SP2P-390 intake and a Quadrajet. Sort of hit a wall at 107 and wouldn't climb past 109 in this short run. This one being a daily driver/towing I didn't press it too hard, just got a little frisky with out a trailer behind it. Had a few stay together and a few come apart doing that in the 65 F-100. Averaged 125 mph for 45 miles with a 390 once. That same 390 with a bigger carb didn't last but 10 miles at 6,200 rpm before it pulled the crank too dry. I suppose in a car it would have been a little more stable at top end but did the job. Have you guys stretched to legs on your daily driver lately?