From what I found out on those head numbers if the source is right they are a Chevy LT 1 350 which is a gen 2 small block chevy with reverse cooling. LT 1-4 heads and top end stuff will not work on gen 1 style block. There is some differences in parts mainly the top half and water pump etc. LT's are good and there heads are similar to a vortec head and if I read right vortec heads was designed after the LT head design minus the reverse cooling. Maybe others will post some more info.