Re: 350 CHANGE OUT FROM 305
87+ small block chevy's are internally/externally balanced. The balancer should interchange, but the flywheel may not. 87+ 305/350 were neutral balance on the balancer for standard production engines(LT and LS series engines are a whole nother deamon), but the flywheel/flexplate has a counter weight on it for all of the 87+ small blocks. The counter weights were different weights depending on wether or not it was a perfomance engine or not.
I'll dig out my interchange book here in a little while and do some more checking. Do you know the casting number on flywheel?
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR
2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD 
AND THE PINK JEEP!!!! R.I.P.
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