Post your 13 second small block combos
To run 13's is not all that hard. I ran 13.92 at 98+ mph in my 65 Barracuda with a 318 and bolt on's. Here's the combo:
65 Barracuda, full interior, all steel, 318 with 273 heads, cut .030, 1.88, 1.6 valves, Crane Blazer cam, Eddy Performer intake, 3310 Holley, Thorley "D" Dart headers, 8 3/4 with 3.55 gears, 215/65x14 tires, MP 166K torque converter, a non-discript 904 with a reverse manual valve body, pieces of uni-strut hose clamped to the front segment of the rear springs to stiffen them up. It wasn't even a sorted out combination; it was my second 1/4 mile run ever; first run went 14.98 at 98+mph(driver error). No changes first to second run. 60 foot times were 2.1 sec zone.
Food for thought, good luck.