HO & Non HO blocks are interchangeable, and Cranks are both the same (casting number: 2MAE). Cam (and computer on SEFI applications) determine the firing order.
HO block casting numbers post 86':E6SE-BA, E5AE-C3B, E7TE-CA, E7TE-EA
Non-HO block casting numbers post 86':E6SE-AA, E5TE-CA...