Difference between 69 & 70 are in the bowl area only - 70 had more dimples & a hole filled with a rubber plug.
Difference between RA III & RA IV are the Heat Risers - RA III had one on the driver's side, RA IV had two - one on each side with the passenger side tube longer (taller).
First pair of pictures are 69 RA III, Second pair are 69 RA IV.
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Some guys they just give up living
And start dying little by little, piece by piece,
Some guys come home from work and wash up,
And go racin' in the street.
Bruce Springsteen - Racing In The Street - 1978
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