Lets clear up a few misconceptions...
335 Series engines are small blocks,
385 Series engines are big blocks,
FEs are neither, they're FEs
Y-Blocks are neither, they're Ys
Windsors are small blocks,
There are FEs that are smaller CI wise than
335s and 351Ws, and 335s that are bigger than
one 385(400 vs 370).
The last thing, The 335 is not a weak block,
big power is to be had when the proper combo
of parts is thrown at it.
Oh yeah, the 351M/400 head is not a 351C 2bbl
head, the exhaust port cannot be smoothed out
like a C head, you'll hit water...and the early Boss 302 head is a different animal altogether,
it has 351C ports/valves while the later had
Steve & the Rockette...
Too many to list...