big brakes - bus lines

[kra710]

Im setting the valvetrain on the new L5 heads
pricing drop beams I started looking at brake packages

specifically 4 piston willwoods for the front
does the increase in caliper pressure affect the performance of the existing brake lines? stainless to the hardlines. I know a thorough check is in order. With the additional weight of the late model T2 transporter and a lowered centre of gravity. Should I be concerned with the compression fittings at the Master cyl?

I am getting the brakes, I just want to know my parts list.

Thanks