I have a set of SSBC's aluminum calipers on my 68. They are about 1/2 the weight of the stock cast iron units. (8lbs versus 16 lbs I think) I particularly like them because they look like the stock calipers. The front calipers are a straight bolt in. The rear calipers are also, except for one small difference. The brake line attaches at a different point. An expedient fix for the soft steel brake lines is to just bend them with a tube bender to make them fit. If you have SS brake lines, they're just to difficult to hand bend and flare. What you need to do, if you have SS lines, is mark where you want them cut and flared (you basically are shortening their length), and then mail them to In-Line tube in Michigan for cuting and flairing. (Well..mail them to In-Line if you live in the US). This mod makes them take on a factory stock installation look.
I have DOT 5 (silicon), SS lines, a rebuilt Master Cyclinder with a SS inner liner. I've got really tight brakes. I plan to install SSBC's calipers in my 70, except I will pick their larger piston option for the front calipers. The larger pistons mean that you can no longer ever use 15" wheels. You need 16" or greater with these. The calipers are a little pricey. Plan on about $1500 for a set. They sell silver cad plated rotors also. $138 a piece (!). However they don't rust like unplated rotors so I will get their rotors for the rear. I have NOS hubs and riveted factory rotors up front, so I'll stick with them since they are pretty much guaranteed to not have a run-out tolerance problem.