I've just embarked on a 351C -> 393C build myself. Intended use? Drag racing
and street use. Hopefully I'll get to screw mine together in the next 4
weeks.

Stroke it. You won't regret doing it. You can run lower stall speed, highway
diff gears and still go stupidly fast. I've gone for a stroker that can rev
but left open the option to tame it down cam/stall and diff ratio wise later
if need be. You may need to do a slight grout fill to assist the block
strength wise. They call this a particial grout fill.

You can go upto 408ci safely in a W block.

Brenden

love me ford V8s but the price of petrol sux balls

red XE station wagon lowerd mags

my clevo had alloy heads ram inake 750holly and an f100 spec cam c4 auto low
ratio limited slip dif lukey extractors turbo mufler dumper :)

the moter at idle just troted and shaked side to side

then i installed a stage 1 cam and at idle it had no lump in it at all just
woke up the hole naberhood with a loud drone

i loved the f100sec heeps of power right from idle just sounded hell tough
idleing around every whare???????

with the mustang being farly light you could go min stage 3 cam i rekon