I am new to this (and any other) forum, so if I am replying incorrectly please let me know. I have been looking for one of these for some time. I would definitely commit to 1, possibility 2 with the second one without the intake ports milled thru. In my early years I was running a 351C with a dual tunnel ram, however the engine developed an oil leak into the water jacket that I could not locate. The Cleveland was replaced with a stock 68 GT 390. The car has been sitting in the garage since 83, and I am working on getting it on the road again. The adapter for the 351C manifold would be a welcome mod. I will keep an eye on the forum for progress.
Thanks.