[Mike Taylor 3601]

624 is 350 head the 2.02 1.60 valve version would been a corvette head not exactly sure off top of my head on year,but gonna guess 80,81

614,I have never seen list 614 on my 79 305 155/235 but never have seen any of these 450 is my other # and what I use
there is a 416, that is also 305 head don't know if 614 is misprint for 416?
or they are very rare?

Most 305's # 450 and 416 are 1.72/1.50 valve (2bbl) 1.84/1.50 valve versions are 4 bbl.
the 1.72/1.50 versions are alot easier to find

I have seen 416's that have 624 on the bottom side of intake runner,but they are 305 heads and are'nt the same as the 624 head for 350, go by the the long number next to springs

You can tell 305 and 350 heads apart very easy by looking between cylinders 350 will be roughly about 1/2 to 5/8'' inch wide 305 will be 3/4-1'' wide
Also 624 casting 350 will be 1.72/1.50,rarely not cracked 1.94/1.50 or corvette 2.02/1.60
305 will be 1.72/1.50 or 1.84/1.50
Mike Taylor 3601