HEADS - HAVE A SMALLER CHAMBER 58CC? THAN A 350 WOULD NORMALY 76CC? (YOUR VALVE GUIDES ARE BAD, HENCE SMOKE AT START UP)
BLOCK - WILL HAVE A SMALLER BORE DIAMETER
CRANKSHAFT - SAME STROKE, DIFFERENT COUNTER WEIGHTS HAVE USED IT IN A 350 APPLICATION BEFORE.
CONNECTING RODS - SAME LENGTH, DITTO ON THE APPLICATION ALSO.
HARMONIC BALLANCER - DIFFERENT DIAMENTER, DIFFERENT TIMING LOCATION (I HAVE NO CLUE WHY).
WHOOPS BREAKS OVER, SEE YA (NO I'M NOT YELLING, AN ENGINEER ALWAYS USES UPPERCASE LETTERS)