Here's a model of a finned aluminum front cover plate that I could potentially offer with the timing covers, or as a separate accessory:
The cover is about 1/2" thick; the thinnest sections are 1/4" thick, so that the aluminum wouldn't deform too much when compressing the O-ring that seals it to the cover. The fins are slightly less than 1/4" tall.
What I would probably do is offer this cover along with several spacers to allow use of the factory components, if required. I would include 3/8"" spacers for the legs of the water pump, plus a donut spacer for the crank pulley and a sleeve spacer for the alternator. On the water pump spacers I think I would groove them for O-rings like I do with my electric water pump adapters, so that on the water pump side they could be attached with sealer, but on the block side the O-ring would do the sealing. Alternatively, in this configuration they could also be used with the electric water pump adapters. As a guess, price on this complete setup would be $125.
Any interest in a setup like this? As you guys have probably figured out, I use posts like this to gauge interest in a potential product, to help me decide if I want to go through the work and expense of making it available. So, if you might be interested in something like this, please post here, or send an email to me at jayb@fepower.net. Thanks, Jay