hi again... the bllock is marked for an 88 nonbalace engineI have the intake off.there is no b/s it is a roller. the heads are from the 87 to 91 group right now I have them packed away so Icannot give the #.the motor has a t molded along with the block# on the back.I have read the h.r.m. article on building it.I also have the article by d. anderson,between the 2 I am confused on int. or ext. balance. can I use v8 pistons and rods? thanks p the g.