looking at buying a 79 bj40 with the b engine. i have seen and read a lot about the 3b but not much on the the straight b. is it just as reliable as the 3b and is it as easy to mate up a turbo. whats the difference between the two engines. ie. can the straight b be turned into a 3b with some boring and head and swap? or is it a totally different block? any help would be sweet.