AAAAAAAAAH one of the most talked about power outputs in recent months after the huge easily obtained 500bhp mark!
never read full post but heres my 2pennys worth on a genuine 400bhp motor................
i ALWAYS use 205 blocks, but not cosworth ones as they have always been thrashed to death.
try and get a low mile 2.0 pinto EFi Auto granada block/engine, i find 205 ones last longer for some reason?!
i always run standard 8:1 "or there about" compression style engine rather than low comp 7.2:1/7.5:1 on pocketed pistons due to the shyte lower end power loss, rather than a large port head go for a slightly re-shaped inlet and polished head, i find this keeps up good torque figures in the midrange.
for genuine 400bhp "on the cheap" you need BD10/14`s and verniers, setup is secretive

and needs a profesional to set it up!
fueling needs (bosch 403) 4 xgreys or (webber 400`s) 4x light blues fed by a gpA Bosch (044) fuel pump
air supplied by minimum of a T34 with .48 housing running 24psi through a 4x4 intercooler or idealy T35 with same boost running .63 housing and/or 500style intercooler.
all above running the obligortary single pipe from turbo back stainless exhaust and free-flow panel filter or K+N style cone filter with cold air feed.
hope this helps!