318 with 360-587 1.88 heads
I don't think a 587 head is a good choice for a street 318.
The stroker with RHS heads should be sold together if the word "mortgage" is being thrown around.
I bet you could get some 675 teen heads for nearly free, and salvage the 360 1.88/1.60 valves, and your wallet will be happier over time. Dollars to donuts, you won't tell that much of a difference in seat-of-the-pants feel and your mileage will be prime with the suggested 262 duration.
If this a nice street machine, the RPM intake is overkill. You might get some $$ for it.
Just some objective thinking here. A lot of people are in your shoes these days.