Question for Levi or other Chevy guys, Timing cover Options

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Ok, I have this 283 engine all ready to go into the car. Nice fresh build, all new parts. I bought a billet aluminum timing cover for it and an aluminum oil pan for it. They look very nice. They both fit on the engine well, but not together. I thought maybe the timing cover was wrong so I got a chrome one from Chevrolet. It fits fine until I tried to put the oil pan on. It still doesnt fit right, it sits about an inch above the block on the timing cover end. So I went and bought a new chrome oil pan but steel this time. Same thing. My question is, was there a difference between the timing covers on a 283? The ugly ass stock one that I took off, fits fine with either oil pan, but the aftermarket ones (Chrome and aluminum) dont with any oil pan. Enlighten me.

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Well, I had to go do a few jobs to pay some bills, I hate how work always interferes with my car time. There is two different seals in the kit as Levi mentioned. I can put the smaller seal in and it fits, however, it is a little long for the area and I would need to trim it down, I think with enough silicone around the edges, it will seal. No, this car wont make it this year to the WCC, it will be up and running before the end of this month though. I am still working on it because I want to drive it. I have gotten it so close trying to get it ready for WCC that I am not going to stop working on it even though it wont be ready. You all know what I mean. Thanks for all the advice though.