its hard to say on price

ofac is hard to get power out of as i dont think it can be mapped, ofab is i think can be mapped but is the most expensive out of frst

and cosy is just limitless really but proberbly the most expensive,

my last engine i done i specced for around 250 was this

low comp mahles with rings 400
head ported with manifolds to match 350
knifeedge crank 200
shot peened rods 150
all balanced inc flywheel clutch 150
cvh34 camshaft 250

then i had to buy gaskets etc, pumps so add another 200-250
bearings 100
clutch 150

in the end i sold the lot for 400 and bouht a std engine that just be reconned by ford for 550 as i wanted teh car on the road

obvioulsy i had to by turbo management etc aswell

but if you dont go efi with your head and cam and if you just rebuild the bottom end and low comp you could posibly get around 220-230 bhp

my std engine made 190 and 216lb torque, just had a chip, filter, exhaust, chargecooler

but efi is the way forward