When I blew up the motor in my 76 formula, I got a junkyard 400 from an old Pontiac wagon. Tore it down, cleaned it up, did all the things that mgarblik mentioned, put it back together with the original pistons and drove the car as a DD for about a year when I sold it to a friend who I know drive it for at least 3 years as a DD. There was nothing high performance about that motor but it ran good as a DD for probably at least 40k miles, maybe more.
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70 TA, 467 cid IAII, Edelbrock D-port heads, 9.94:1, Butler HR 236/242 @ .050, 520/540 lift, 112 LSA, Q-jet, TKX (2.87 1st/.81 OD), 3.31 rear
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