427 side oiler ?

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Hey guys, need some advise on 427 side oilers. I have a 428 in my cobra now, very happy with it but.......I have a chance to buy a a side oiler. It is only the block & bottom end, stock crank, 7 pistons & rods. A guy put it together, waited a year to fire it up & I don't know the details but, it must have broke a rod & or, a piston ? That cylinder needs to be re-sleaved. I dont have any details on the motor yet, but will soon. I need advise on price "as is" if the block & ect. are in good shape, the apx. price of a build-up & parts, for around 500-600 H.P & torque, on pump gas. I'm running 10-1 compression in my 428 on pump gas. I drive on the highway a lot so I do want "respectble"......gas milage. I built the 428 to be the best of both worlds, good performance & driveability. I do like the RADICAL....sound of a cam & compression. I help on a sprint car & if is was do-able, I'de put one in. hehe! I will either keep my 428 for parts for the 427 or sell it for money for the build- up ?????? BIG question.....please explain the "side oiler" for me ! Pro's & con's of it, have to run a dry sump & how the system works, what heads, intake, carb/carbs, ect...ect... I don't have thousands of $$$ left after building the car so, moneys tight. Please give me your ideas ! ( I'll try to get more details & numbers on the block soon )
Thanks,
Kev