There are a lot of considerations to think about. I ended up with 13" C4HD fronts as the C5 set up did not fit my American racing wheels and 12" LS1 rears. I have a C3 master with a 15/16" bore and Wilwood adjustable combination valve. Full disclosure, I just bled the system and have zero miles on it but the pedal feels good on the jack stands .
I can tell you that the availability of new LS backing plates are sparse. I was able to get one side off of Amazon but the other side, I had to piece together out of a pile of parts I have collected. The install is easy enough and has been covered on the net but the primary reason I went with the LS brakes is that I "thought" I would be able to configure the set up to easily work with my factory E brake. I found out the hard way the S10/LT1 set up is not the same as the LS1 as the S10/LT1 backing plates have provisions cast into to them to fit your ebrake through. The LS1s do not and you will have to fabricate something to support the ebrake cable.
Another consideration is the LS1 rotor typically requires a 16" or larger rear wheel. So if bolting on a set of 15" wheels with drag slicks/radials is in your plan, the S10/LT1 rear disc set up might be a better all around choice as dealing with the ebrake is easier and both will accommodate most 15" wheels.
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71 Formula 433, Splayed cap 400 block, 4" stroke Scat forged crank, 6.8 Eagle rods, custom Autotec pistons. SD 295 KRE D ports, Old faithful hybrid roller, Torker II, Holley Sniper Stealth, Tribal Tubes, TKO 600, 3.73 Eaton posi.
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