Does it have a set of captains bars cast into the block above the starter?
1953 Bel Air which came with Powerglide transmissions had hydraulic lifters. It was the first 235 with full pressure oiling system. It had the captains bars which instantly differentiated it from the low pressure 235.

1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission