NEED HELP on engine type/size, Previous owner's mods ???? Options

[Str1974]

Guys, I really need your expertise on this. I had purchased a 1974 914 1.8L a while back. The former owner advised me that the engine was not matching. Looks like a previous owner had taken a 1.7 liter case and modified it to be a 1.8L and use a Bosch L-jetronic brain as well as all the air intake/manifold designed for a stock 1.8L. It ran well before I pulled the engine for a new clutch/flywheel etc. project. I had verified that the chassis number matches a 1974 914 and the engine number matches a 1973 1.7L (EA026464).

My real problem now is that I really do not know what exactly was done to the engine to make it a 1.8L. I want to keep the L-jetronic fuel injection system, but if I do want to do a stock engine rebuild, what parts would be for a 1.7L and what would be for a 1.8L. I have researched all over about 1.7L engine mods, but they all seem to be "how to modify a 1.7/1.8 to a 2.0L. Nothing what would have been done to make a 1.7 into a 1.8. an anyone please fill me in on the Possible Mods done to my engine? I have various service records that go back to the mid 80's, but it looks like the 1.7 to 1.8 mod was done prior to that. All those records seem to only mention the car being a 1.8L. I'm afraid to replace parts , not knowing how it became a 1.8L. Please advise, thanks.