ZLX question

[Geo]

I bought a ZLX in 1969. First I ordered the short block, and then I ordered the ZL1 Aluminum Open Chambered Heads which took 3 Months to get due to having to wait for them to be produced. The heads came bare so I had to get all the parts to complete plus I had them CC'ed. This engine is the same as the ZL1 except that the block is cast. ZLX is the ZL1 with a cast block. I put the engine in my 1966 Chevelle SS which I still have. The car has been stored most of the time sense 1973 due to me being stopped by the police. I used to street race and the car got to be known and that's when the police starting pulling me over just because they knew the car. I always run the engine every so often. I had the engine gone through installing all new bearings. It has maybe 1500 miles on the engine. When I ordered the engine Chevrolet called it a ZLX and that it was identical ZL1 but had a cast block.