[2blu442]

Hi Starfire
The 1970 motor is respectable as it is. I used a 1970 engine out of an Olds 98 for a 1970 442 and that motor was rated at 365 horsepower and 500 foot pounds torque, smooth idle factory engine. If you've got the money to go aftermarket that has the potential to give you more power, but what are the plans for the car? If it's just for street use, not raceing you could put in a better cam, intake and carb and be close to 400 hp with very good torque. Back to the heads, they made both 2.00" intake valves and 2.07". From the outside there's no way to tell which you have, you have to pull the heads and measure them. If they're the small valve, you can have them cut out to the 2.07 and insert hardened valve seats if you want. So it's up to you, but I'd consider the end use of the car and how you want to spend your money. That could be a very good engine to rebuild, put in some performance parts, maybe do some flow work on the heads and have respectable street car.