New World Datsuns...

so i found out that the l16 in it is just fine it needs a head gasket repaired but i have the whole kit already gonna have pics of doing it this friday this should be really fun and thanks my friend justin said this is a great side and im looking forward to being here for a long time!

so i just got this 1973 620 pickup it had an l16 in it little 4 speed the motor was completely taken apart and im just gonna throw a l20b in it since it bolts right up as i have been told i just need some information on if the wiring harness mounts right up to the l20 and if i can use the 4 speed ...