I've just replaced the head gaskets on my 95 4.3 liter vortec, I replaced the head gaskets bolted the heads down and torqued bolts to specs, Then it had to sit for two weeks before I could finish up on putting it all back together. I marked dist and put it back in exactly the way it came out. When I tried to start it , It will turn over but it will not fire. I am getting spark to cap from coil and from cap to no 1 plug. pulled plenum and I am getting gas to spider assy. I have double and triple checked everything and I cannot see anything that I have missed.I have had someone tell me that I may have collapsed lifters and that I need to pull dist and use tool to pump oil pressure back up to pump up lifters, I dont know if this is the problem or not, Can anyone give me some ideas or answers to quide me in solving this problem. any info would be greatly appreciated thank you.