408/360 question

408 will work good in your car, lots of torque! I've had a 318, 360 and 408 in my car which is very similar to yours. You can build a 408 to 450 hp and it will be very streetable. Your stock motor mounts will not hold up, and drag radials will be the only way it will hook on the street. The Dougs headers are great but for a 408 I like bigger primary tubes like tti's.
360 or 408, it will run good, mine ran 12.50's with the 360 and 11.80's with the 408.