My current engine is a L24 with a E88, but what e88 i couldn't tell you. I don't really know much at all about the current set-up, but it works? I've never pushed it, currently makes 148rwhpat 13psi spike levelling out at 11 psi. It's running all the gear off a L20 turbo engine, so would be quite restrictive on the intake side, which would explain the higher boost required for not too much power? On the Autronic compression is listed as 8:1, the engine was rebuilt and owner said it was given oversize pistons, possibly put in a dished piston maybe? Owner made it sound like he used the original head as he mention it being drilled to suit the injectors. Matching numbers block so that would make it a 1973 e88? All speculation on my part, I did not know as much about engines or Datsun's when I purchased the car, but I don't regret my purchase