Nick,
If the engine is not a brand new one, then I think you mean either a 289 or 260 as Ford never built any 280 CI engines in the 60s that I am aware of. I believe one of their newer Mustand engines is 281 CI.
The 289s came in 3 versions mainly. Stock 2 barell rated at 200 horse, stock 4 barell rated at 225 horse , and the 289 HiPo which was rated at 271 horse. The 260s 2 barell was rated at 164 horse in 1962. Then in 1964 the book shows a 2 barell 260 as being bumped up to 200 horse.
There was a 221CI inch engine that was the predecessor of the 260 and 289s but it wasn't around long. The book only shows it for 1962/63 in a 2 barell version which was rated at 146 horse.
I am getting this information from my Ford Peformance Book by Pat Ganahl. Welcome to the club.
Ron
