The inspection mirror and flashlight method could work from the top. The 340 or 318 or 360 casting number is cast on the driver side of the block partially hidden by the starter.
Small block engine colors, my observations: (
)
273's, '64.5 thru '69- red (maybe some early versions were gold in B bodies???
)
318's, '67-'68 (69-'70?
) red
318's, '71 -80's Mopar blue
340's, '68 - red
340's, '69 - big block Turquoise
340's, '70 to late '71, Orange
340's, late '71- '73, Mopar blue
360's, '71 to 80's, Mopar blue
318's and 360's sometime in the (mid?) 80's went to black
