Engine replaced won't start

I replaced my 325is engine w/90-325is won't star-only-pushing it Help....my daugther destroy my engine in my '87 325is crack the oil pan and the rest is to sad to tell ...well I bougth a 90 eng. from a true 325is... nice
cleaned every inch on this engine and painted original black and aluminun colors ...well my problem is: installed the engine on the car, all electrical works I did not use the 90 wiring harness a little different than may.
but would not start with the key.... starter won't turn but i pushed and was able to started.... pull the starter assembly out and tested outside it did kick....put it back on and nothing all I hear is a electrical spark please need info on wiring the starter: main power from battery to lg screw with the alternator-red wire and blk to small screw is that correct?
and if is any starter relays.....thanks for any feed back !!!!!!!!!!!!!!!!!

Did you refit your engine earth strap.

what you can try to see if it is an earth problem is place a jumper cable from the battery negative to some where on the engine and try starting it, this will tell you if your engine to chassis earth or battery to chassis earth is the problem. There is a starter relay for this vehicle behind the cubby . If you want to connect a relay for the starter use a standard 4 pin relay and connect battery positive to term 30 on the relay , battery negative to terminal 86 on relay , the black/yellow wire from the ignition (cranking wire) to term 85 and a wire from terminal 87 to the starter on the ten nut ( term 50 ):grinno: