WC 5/7 drop ???s

[1FaastC10]

since i sold my K20, i've got a decent ammount of cash to play with, and i'd like to start building my chassis. i've pretty much decided on a Western Chassis 5/7 drop kit. i've just got a few ???s about this kit. it says it uses 2.5" spindles, and 2.5" coils in the front. im going to be replacing all of the bushings/bumpstops in the suspension, will factory rubber type bumpstops be ok for the front? or will i need to look for something shorter?

also, for the rear, it says it uses a flip kit and shackles. what material are the bushings in the shackles, if they're standard rubber bushings, will my stock bushings fit in there? (i'll either be using Energry Suspension polyeurethane (sp?) or polygraphite bushings) i think it would be pretty pointless to spend the money on poly bushings, and have cheap rubber bushings in teh shackles. could there be any ill effects of this?

i found a place who sells the kit for 579.99 (Doetsch Tech shocks included) and free shipping, which seems like a pretty decent deal, although im still looking.

any help/comments are appreciated.