Jeep Strokers

I am wanting to stroke my jeep but wanna be able to run 87octane instead of the more expensive stuff.I am looking for more torque and more usable torque lower in the rpm range. So I was thinking of doing the 4.6 low buck low cr stroker. With the specs I found online for it:4.6L Low-buck, low CR "rockcrawler"

Jeep 4.2L 3.895" stroke crank
Jeep 4.2L 5.875" rods
Silvolite UEM-2229 +0.030" bore pistons
Increase piston dish volume to 30cc
8.75:1 CR
CompCams 68-115-4 192/200 degree camshaft
Ported HO 1.91"/1.50" cylinder head
Mill block deck 0.035"
Mopar/Victor 0.043" head gasket
0.058" quench height
Ford 24lb/hr injectors for '87-'95 engines, Accel 24lb/hr injectors for '96-'04 engines, '98 Chevy LS1 25.2lb/hr injectors for '05-'06 engines
240hp @ 4700rpm, 315lbft @ 3000rpm

I already have the upgraded bosch injectors so think ill be fine with them. What else will I need to change and how can I be sure I will be able to run cheap gas with out spark knocking?

Polish the combustion chambers and piston dishes so that there are no sharp edges, and service the cooling system so that the engine doesn't run hot. As long as you follow my recipe the engine should run fine on 87 octane.