engine timing dilema

[Painter D]

ok guys here goes, i recently installed a complete top end kit from trick flow on my sbc 355. it came with alum. heads a 494 lift cam, timing set roller rockers the whole 9 yards . anyways heres my issue, i have to set the timing at 30 degrees at idle, at the crank to get it to run the best. so when i accelerate my distributor advances it another 22 degrees so if im thinking correctly thats 52 degrees total timing. from what i hear thats way too much. when i try to set it any lower at the crank it backfires up through the carb. so heres my question if it runs good, and if it starts good is it going to be ok to leave it at this setting? everyone ive talked to scratches their head and says,"thats weird". any help would be great.