ok i need help on this one (kind of an update)

i swapped my heat seized 2.2 motor for a newer 2.2 motor, & it started over heating as well, (same problem)  the radiator was cracked, well i got an aftermarket radiator & a 180 thermostat,  & then the head gasket blew in the new one, slobbered oil all over the place & had thick white coolant smelling exhaust coming from my new tips  after i started @ my last carshow. after that the starter broke the teeth on my flywheel where i couldnt start itfor the 3rd time.  [I ALSO MISSED ARKANSAS'S BIGGEST & BEST MINITRUCK & CARSHOW BECAUSE OF THIS]   (its now stuck @ my girlfriend's house & popping the clutch wont start it either)so now im on engine number three, im fed-up with the 2.2 & im now in the process of buying a 95 tbi 4.3(more reliable & has more power)im getting the rebuilt engine (10k mi), transmission, starter, driveshaft, & radiator for $600 all i need is the ecu & wiring harness

my question is: how long would it take to do the swap, will i be able to use my stock gauges, & is there a site that sells ecu's & complete wiring harnesses?????  
tha neon is red, my truck is 2 & ile b Damed if my headlights are too lol