[Ford78]

I have a 1978 F-150 that I have redone.......The original motor that was in it was a 351M......I just recentley replaced the motor with a 351W from a 1985 Ford E250.......I noticed I'm having a heat issue.......My motor after about 30minutes or so seems to get warmer than it should be.....I have a 180 themostat a brand new water pump and I had just rebuilt the motor before I put it in the truck.....The heads weren't warped, cracked or anything else same goes for the block.........Please give me any advice you have about this I'm goin crazy trying to figure it out.