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The 68 is a 67 engine with the exception of the smog pump and 060 retarding distributor. If you change the engine. You will loose the matching numbers for that car. Unless it has already been done.
Unless you are standing there and micing the case until you find one that is Standard. You will not know if it is better than the one you already have. Also unless the case, you already have, is cracked. You can have it put back standard. One of the best for head and case work is Ollies. They have moved from southern Cal to either Arizona or New Mexico. You can find them advertised in the PCA Pano.
One of the biggest problems, now days, is finding the main bearings and the sizes you will need. Standard/standard is the ideal. The combo sizes of 2nd and 3rd over and under can be a nightmare. I understand that someone may be making mains again. However, I am not sure about the quality and how many different combo sizes they would be making.
I would have my case put back to standard and buy a new forge crank. When building a Porsche engine. The money you save on the build is the part that breaks. The weakest part of a Porsche engine is the crank and bearings
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