Building 69 383 for my 69 dart.

You are correct in your accessment of your 383 build . I have just finished mine and I am at about 420 h.p. with iron heads . I changed to forged 383 Magnum pistons for a little more c.r.. My h.p. to weight puts me in high 12's-low 13's . Your statement "A nice cruiser with 11-12 second power is good " is an ambitious goal that 8.5 c.r.. You need about 466 h.p. at the crank or about 375-380 at the tire . This goal can be achieved but it is not a budget build . I would be glad to help you achieve your goal if you wish . Later, Tom