Bracket engine, what would you build and why?

A lot has changed over the last 10 years. There are some decent value parts to put something together that doesn't have to work as hard to get the result. Bracket racing is about racing. Not maintenance. If it was me, and I was looking for longest racing service life, I'd build a 500" B wedge. A good set of heads and mild solid roller and it should last seasons without freshening rings or springs which will be the wear items. I think the longer stroke will pair with the 'Glide but you would need to change the convertor and maybe regear. The budget would set the parts list. Starting with nothing you're probably looking around $12K to have it turn key dyno'd and ready depending on the builder.

I'll add being affected by temperature is not really a concern with the bigger engines too. They just don;t have to work as hard and as such are less dependant on local weather conditions for "perfect air".