Front Disc Brake Conversion Confusion

I know there are a zillion threads on FABO about front disc brake conversions. They mostly all regard unique situations. I couldn't come up with answers to my situation. So here goes:

I have 74 Dart Sport (cloned onto a 70-71 Duster) it's a slant car with 9" drums and SBP. I've replaced the rear brakes with the 9" Ferd I'm installing. They're 9.5" drums that I have found out are GM. I have no idea why, I discovered this after I bought the D150 pro street truck it was in for parts. (I bought 4 1/2" BP wheels and found they wouldn't fit. I'm redrilling the axles.)
Anyhow, I need to upgrade the 9" fronts to A) increase stopping power, and to B) change the BP to 4 1/2.
I'd like stay with something on the lighter side, as it is a street/strip car. Wilwood has this kit:Wilwood Disc Brakes - 1974 Dodge Dart Demon All - Front Brake Kit No.: 140-15465
But it says I need to have a factory disc spindle. Also needs master cylinder, adjustable proportioning valve, and maybe other stuff?
PST has this kit:i-23158284-front-manual-disc-brake-conversion-kit.html It appears to have everything, including master cylinder, adjustable proportioning valve, control arm, spindles.
I plan on rebuilding the front suspension. This seems to have most of the replacement suspension parts included. I don't know the weight, but the completeness is appealing.
Is the PST the ticket? Any other options?
Actually, I wouldn't mind 10" drums, probably from a B-body to get the BBP? That should be cheaper than the PST, but I would have to get a MC, pro valve and?
But again, the completeness of the PST works for me.