Never saw a set of the aluminum caps before though Joe told me they were available. Align boring/honing is always a little tricky when one side is AL and the other steel. Aluminum caps would help with that and they would definitely save you a few pounds but might wonder how well they hold fastener torque. Probably not much a concern for racers since they get torn down after every race. The steel caps are also beefy and splayed. Here's a pic.
Fontana blocks also require a unique front timing chain cover. They look like a Windsor cover but are different because Fontanas use Cleveland oil pans so the pan rail is different than an ordinary Windsor. There are several versions of the cover available; one that receives ordinary water pumps and the other that takes snout mounted pumps. If you have one, you'll want to offer it with the block if you decide to sell it. Like I said, Fontanas are nice piece. I own two 9.5 deck Fontanas. I sold Bosswrench my 9.2" deck Fontana block. I'm sure he'll be chiming in soon I'm sure.
Take care,
Kelly
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