55.2-59 Big block clearance and cpp ifs coils too long?

[dsraven]

if the springs are brand new they will, of course, sag some. what you wanna end up with is the lower control arms to be level with the ground at ride height.
sounds like what you are gonna be looking at is the firewall modification. wht I recommend to do is first cross brace the area, behind the firewall, in such as way as to support the area but not be in the way. the cut away the area in question. do your engine install and leave room for the oil pan and pulley/fan set up between the rad. then when all that is in and you have that completed, worry about the firewall. you could then fab something from scratch, use a modified steel wheel barrow tub or buy a recessed firewall kit.
without seeing your truck, I highly recommend to check the hinge pillars and cab mount areas before going too much further. sometimes the firewall is whats holding things together.

[Spank-a-lank]

so my lower control arms are nowhere ner level with the full weight of the engine and trans. I tried to attach photos but it wouldnt let me upload them. it seems waaaay off to me...they are even bowed out a little. I need to call cpp and see what they say. I ordered some original style short valve covers to see where I am going to need to modify the firewall. not a lot from the looks of it. may even be able to shave down the bellhousing mounts to drop the rear a little. id rather not cut on the firewall if I can help it.