Slow 1/8 with 74 440 dart

Finally got my car together this summer and i ran it at an 1/8 mile no prep near me. the car is a full interior 74 swinger with a mild 440 with stock cast bottom end besides speed pro L2355F pistons home ported open chamber cast heads with new seats and valves. carb is a 750vs holley. it's got an isky mega race .505 cam with 108 lobe sep. with valve springs and all. it's got a 3000 stall converter in front of a manual 727. also got 4:56 gears with spool and SS springs with 3 way adjustables and cal tracks on a 29.5x10.5 slick. my issue is it ran 9.1 at 78 with 2.01 60' launched at 2500rpm footbrake no wheel spin at all. shifted around 5500 into 2nd and 3rd as it was my first pass on it so i was going easy. are these numbers i should expect from this car? i was expecting atleast 8s lol. the only issue i had was this cam is really picky with timing wants like 30deg at idle and 36 all in and at the time i didn't have a limiter plate in the distributor so it was advancing more than it liked and was pinging at 4,000+rpm. could my timing issue cause that much of a difference in ET? i know it's a lot, just wondering what other people would think