440 wont start

did a compression test 130 140 psi in cylinder 1 and 8 there the easyest to get to big block in and a body makes it had to get to some plug plus the tti headers make it really hard i also pulled the valves covers and every thing looks to be working right no bent pushrods no messed up rockers also checked spark its sparking every 4th stroke so its not the pick up or msd nice bright blue spark so the coil seems to be working right