Opinions on low end 360?

Well, Here goes nothing...... With pistons down .090, your Scr is about 8.4.
To me this is bad news,for what you are trying to do.
It is my opinion;that you will need as much Dcr as possible.
If you have to start from such a low Scr,the cam will need to be very small indeed.Extremely small. If you are on a serious budget, you might consider a good used oem 360cam or even a teener cam.Even a tiny 252/112 cam, will put the Dcr down around 7.25, which is pretty soft. The 2200TC will help get your revz back up, but since you say you will be keeping the revz down, your engine will be constantly operating in the 7.25 to 8.4 CR zone. This operation, in a heavy E-vert will not be fuel efficient.Nor particularly snappy.It wouldn't take much math to justify a new set of hi-Cr pistons.

Getting a set of pistons to Zero deck, might get your Scr up to 9.65 with 86cc total chamber volume. This with a 260/112 cam, would bring your Dcr up to 8.1ish, and your engine will now be operating between that 8.1 and 9.65. This will make a much different engine, especially since you will be operating in a throttled to heavily throttled condition,some 70% or more of the time(a guess,to be sure). I'll take a wild guess that this engine might get at least 1.5 to 2 mpgs better around town and double that, in steady state. In Canada,In about 6000 miles I will save the cost of the pistons. In 10000 miles I can easily save the cost of the pistons and the labor. In the Usa, I imagine you will break even, a lot sooner.
The KB line has a piston with a specialty dome on it, that can be adjusted to make a tight quench, in an open chamber head.

There are other ways to get the Dcr up. You just need a smaller total chamber volume than the approximate 100cc that you now have. That .090 down is costing you 18.5cc