Older combination. Full weight '70 GS. Untouched 45,000 mile '71 short block (std bore - cast pistons) '70 Stage 1 heads, no porting, shaved enough to ensure they were flat, 0.020" steel head gaskets. KB MkC118 cam and KB "Stage 1" springs, stock replacement timing set. Stock steel rockers. B4B intake no porting. '71 7041242 Q-jet with stock (75 Jets - 45b primary rods - AU secondary rods) Stage 1 jetting. MSD 6AL ignition box - Chrysler magnetic pick up in GM distributor w/20 degree(at crank) total advance in by 2300 rpm. Total timing set to 30 degrees BTDC. MT headers, 2-1/2" exhaust with Sonic (short) Turbo mufflers. Too loose (3600 flash stall) 10" TCI converter on rebuilt TH 400. 12 Bolt rear w/3.90:1 gears. M&H DOT 275-60-15 rear tires. Best ET was 13.11 seconds at 103.5 mph. Probably could have achieved an ET in the 12's with this combo with some timing and jetting adjustment, but was fighting a weak battery all weekend. Just goes to show very low 13's are doable with bolt on parts.