Trying to decide if its a good investment to purchase a 77 cruising wagon with a v6.....I have an 80 sedan wagon with 4cyl......how hard is the change for these 2 engines?.....I know the windshield will not change out..... I am more thinking grill, marker/running lights, doors, back glass/window, doors/door handles, wheels...etc. etc.

thanks.

The doors will bolt on but in the back /top the sedan has a curve for the roof line , the wagon is straight , the grill , marker lights and running lights will not fit , unless you use the fenders  and hood , side door windows are straight on the wagon , I am putting a 75 front end with a 76 grill in my 79 Cruze wagon, the windshield from the 77 would fit the 80 but you have to buy the gasket that goes around it to do so , but I would keep the one you have in the 80 , its glued in like the newer car and less chance to leak , wheels and every thing is the same , to 77 has a 8 inch rear because of the V6 , use it , hope this helps , and also do not throw anything away , you or someone in the future may need it , 🍺

The 4 cyl trans will not bolt up to the 2.8 , even if you got the belhouseing , if you want to keep it stick you have to find a mustang two four speed belhouseing and use the T-5 trans , the 2.8 will swap easy , you may have to swap out the front coil springs , all wagon use the same tail lights , wagon doors will fit all wagons , sedan door will fit all sedans ,