87 gm tbi will not start
Ok so I have swapped a 400 sbc into a tractor with a 350 tbi topend. When I go to start it I have spark and fuel but it will not run. I have checked valve lash and compression. Both were fine. I played around with the timing of the distributor and spark plug wires. It will backfire and shoot flames but it won't start. I have checked the iac and it works fine. Like I said it has fuel and spark and I have spun the darn distributor right around but it will not fire. I'm not sure what's going on. Any help or advice would be great.