best machine shop/porter for 340 j heads

i shpuld be running mid 12's already i got one run up at maple grove, my father didnt get the drag radials hott enough spun through first and second (stick car 3.73 gears) and ran a 13.2 so the car has too already be into the 12's, the car isint a daily drive its a car i enjoy taking to cruise night not too far away and haveing some fun with.

no NOS, blower etc. only n/a for me, sorry