68 Fastback questions

My 68 GT mustang It is a 100% original car (never been restored) but the 390 seized and was replaced.

The outside has the usual rust, nothing serious all repairable.

What would its value be at? I've been offerd 35,000 with no intention of selling but just curious.


The motor replacement is a 351C 2v, I'm wondering what its capable of. The previous owner said it was fully built up.
I've never been through the motor and it has been in awhile.

It idles about 1200 rpm, with a 850 holly carb, and edelbrock intake.
Its got a 4 speed in it, with a hurst supershifter kit w/e installed.
I was told it was putting out around 400 at the rear wheels,

but is it possible with this motor?

Would this motor be worth keeping and useing, or find another 390 and performance that out?

The fastback is full GT all the luxaries with 4.11 limitslip rear
This car may be all original but in the future its going to be a high performance restoration for me and my dad.

I hope someone can answer my questions