I think you will find once you put a good rod bolt (ARP) in the stock rod, refinish the crank, refinish the rods, buy pistons, rings, bearings it is not much cheaper than just getting a SCAT kit. And at that point it doesn't cost any more to go with a bigger stroke.
If I was doing it I would get at least the AFR 205cc heads. They aren't much more money and it is difficult to "overhead" a motor (as long as you are sticking with a conventional streep/strip purpose head). If you get the 185s and ever go stroker I think you will regret not getting the bigger heads. Whereas with the 205s to begin with, although they may be more head than you "need," they aren't going to hurt power. The ports aren't so big that flow is going to be lazy. AFR has some good copyable builds on their site utilizing their out of the box heads on 10:1 windsors making like ~450hp.
I agree on the chrysler orange box; cheap, effective way to go. The MSD won't gain you a single HP, but can give you the rev limiter with 6AL.
Edelbrock RPM is the best mild/hot street manifold for just about any carb domestic v8 in my opinion. I like holley carbs the best for performance. Good luck!