[Excaliber]

Actually I think there fairly accurate for a MODIFIED well built engine. It is NOT unreasonable to expect 600 plus horse power from a side oiler using 'over the counter' parts that WERE available in the 60's. Like Tunnel Port heads, High Riser heads, Tunnel Wedge Heads, etc. 12 to 1 or better compression was 'standard' on a side oiler. Wild cams were available as well, in the 60's! Theres a reason NASCAR banned BOTH the Hemi and the High Riser side oilers in 1965 or so, TO much horse power!

As for the Hemi running 800 plus, yeah I could see that. But I'm not SURE it could have been done using 'over the counter parts' available in the 60's. Not an expert on Hemi's, all I could say is 'maybe'. I wouldn't be surprised if it was possible even in the 60's, using the 'good stuff'.

Chevy? I have no clue...