Peak HP from LA block w/ no problems

Simple question. Again focus on a STREER driven musclecar. (not a 500hp drag car) Pump gas, 10.5:1 comp. or lower..mild cam and Hughes StageII heads..either 360 stroke crank or the 4.00" crank.
Q- Does anyone have over-heating problems using the stock Chrysler cooling system, during summer ?
...... I have new 3 core 22" now (viscous fan & shroud) with the stock 340 and she runs very cool.. The old 2 core ran right dead center on the gauge, so the new radiator is doing its job. The rad. shop I used has a helluva rep...does tons of street rods & musclemachines. { He was positive this core he got for me would handle anything I could fit under the hood and run on the street.}
I am getting conflicting info. on whether a mild stroker is even streetable, as in useless over 80 deg out. I find that doubtful..I think someone is needlessly trying to f**k with my head or is just a bullsh!t artist. I'll ask the guys HERE first!!
---anyhow, I will not consider an aluminum rad., but will consider the 8 blade HP water pump.., over the stock 6 blade pump.