The mutha thumper cam ,intake .497 lift duration 287
exhaust .483 lift 304 duration
And 34degrees total is more than his edelbrock heads with a modern combustion chamber need 32 degrees should be about right .
Now if he was running iron heads with an open chamber he would need the 34 degrees or more to get the motor to rev
isn't large enough to warrant that much timing and it would idle awfully high at 18 + degrees.
As far as a lazy rev the timing curve done correctly will take care of that
And to much initial timing will make it hard for the starter to crank thus hard to start also