72 Looking for some round about advice here please.

[xfsketch]

Ok story goes. 72 chevy had 350 in iy points dist converted to hei. I heard some knocking in the 350 and decided instead of rebuilding it to set it aside and throw this 305 The guy who sold it to me was asking 250 for it and when I went to see him he had it laying on a rack on wheels in his garage without a manifold carb and extras. He had painted it he said. He claims the motor came out of a monte carlo 86-87 and that it was his friends motor that he had heard run before. he said it has a big cam in it but Im unsure if its mild or big. He said it sounded mean a few years ago. the reason it was out of the car he said his friend was rear ended and the motor was pulled because the back of the car caught on fire. I trusted his word. he was nice and I believed his explainations. He even asked if I might drive by and show him the motor running again when I put it in.
I pulled the 350 out and before I put the 305 back in I painted the engine bay and firewall, cleaned up the wiring and began installing new seal on the valve covers, intake and fuel pump. I used my intake, carb, manifolds, fuel pump, alternator etc from my 350. I pulled the oil pan off and loosened the bearing caps enough to replace the rear main seal and then re torqed them to 75ft pds. I then replaced the oil shaft and pump and installed a new oil pan seal. Everything seemed to turn ok It wasnt until later my friend and I realised it wasnt turning over all the way. My friend Jeremy fixed that by the next morning with some liquid wrench. I slapped some new motor mounts on the block then we lowered it in. Hooked everything up. Little confused on some of the wiring. Ive seen and have copies of the wire diagram on this site thats been photoshopped. very nice but I still cant get right lol. Im hoping if I type long enough here and send some pics tomorrow attached to this post some of you can help me figure out why my motor isnt starting and what wires are rigged returned to good. I have dropped the distributor numerous times can get it to fire but wont stay running. its getting spark and gas been squirtin either in once and again it fired that way too. even turned the oil pump shaft a couple times. To my understanding from what I recently read the firing order on sbc is 18436572 and on the distributor from the wiring harness in a clockwise direction the second peg is where you place number 1 spark plug then from there you continue on 843..6 etc. I dropped the distributor with the rotor button settling on where number one peg on the distributor was which looked facing straight forward to the carb. Its an edelbrock carb. everything I used on the 305 started the 350 to begin with. I installed a new voltage regulator and changed the fuel filters. This is the problem so far. I will try to send pics no promises lol.