Are FE engines in the suicide door Conti's?
Yes, but the engine might only be a 390. Most blocks say 352 on the left front of the block, only way to tell a 428 for sure is too look internally at crank and block casting numbers. The 427 had cross bolt maincaps like the hemi.
Many engines have their place in history. In 1966 the "farm engine" placed 1st, 2nd, 3rd at the 24 hours of Le Mans and won the Index of Efficiency for speed and fuel economy. The 427 FE's in the GT 40's dominated the LeMans races for 4 years.