No Spark

I know there are many, many threads on no spark in the forums but I feel like I have a unique situation with some "what ifs". So I swapped my 351w from my 87 sn2001 into the 89 hull. I finally got everything in the boat and hooked up, but cant seem to get any spark. From the ignition coil, Still have points on the boat, and I have never messed with them. There is a faint spark when turning the motor over coming out of the coil. Checked the ballast resistor (12v) and getting power up to the ignition coil (checked the + and -) sides of the coil. Will the oil temp indicator light on the dash being on cause anything to be locked out? also, could there be any conflictions in using the harness out of the 89 plugged into the harness from my 87 motor? I need help narrowing down my problem

Did the 87 engine run before you dropped it into the 89 and if so, how long ago did it run? Did you clean up the point set contact faces? Did you try to mimic the point set by disconnecting it and then grounding the - side of the coil? Yes, as Ken mentioned, maybe you should mess with a point set more.