for a strong reliable 400 bhp id suggest a 200 long studded block std cr valve cut outs bd14 inlet gt3076 and 55 lb siemens 4x4 inlet..not only will it be strong and last longer than a rebuilt 205 block it will bring you bang up to date as in terms of turbo etc and youl have more than 400 bhp...oh yeah the turbo will last longer than a t34 at 2 bar to...
if your intrested pm me iv got a complete rebuilt longstudded engine for sale...
cheers danny