[willy]

they ( 302& 350) are both good engines. I've had a couple of both and they always were reliable. Each had their consistent issues that neither company seemed able to completely address.
Ask the NY City cabbies, they run the chevies into the dirt, they will all tell you the same, the 350 will run crappy forever.
If you are mechanically inclined and take care of them they both will serve well, my first Bronco had a 302 with 160,000 on it when I bought it and on its first trans rebuild just before I picked it up. I bought it to beat and take off road all the backwoods places I was hunting then. Figured I run it to it died and then put in a fresh engine. Well I sold it to buy a new Bronco a couple of years later with just under 200 G's and a lot of abuse and it was still strong as an ox.
Chevy's were pretty much the same. Though in earlier engines I preferred their big blocks for their smooth power and torque, and reliability. The Ford big blocks never impressed me.
The 350's I had in cars and trucks, one Blazer were good engines, not great. But reliable.
If you took care of them they lasted, all of them, they were made by Americans, until more recently, hecho in mexico etc. and I loved them all.