The HEI distributor on my 250 is a big ugly thing. It's about 6" in diameter and is NOT the model with the coil in the top. Is there a more 'non HEI' looking distributor that will interchange. I'm even thinking about going to an older points version and doing the internal component swap.

You can see it in this photo.

The one you have is the best one to use.
The ones without the coil in cap are harder to find as they were for A/C equiped vehicles. The caps are indexed differently bewteen the two types, so if you were to switch caps, you need to file a new slot in the housing. Getting the ones with the coil in cap are not hard to find. If the local yards don't have one, Ebay will.
Tom Langdon sells a mini HEI based on the 2.8V6 dizzy for use in the 235/261 type engine. I know it can be made to fit the 250 as well.
Otherwise, old school flat cap Mallorys show up on Ebay occasionally. It can be converted to electronic.

A side note, if you are running the 153 tooth flywheel and you don't want the tranny angled like that, get a 403 bellhousing. They are common as dirt. They sell for $20-40 on Ebay all the time.

You can up grade the Old point style dist with either a pentronics unit Or one from crane pesronaly I think the crane unit is easier.

there is another version. it uses a computer to control timing though. it is a newly manufactured unit based on gm's later model small cap HEI's. it is on ebay right now. maybe you could use it and use something else to control timing. tom