Looking back at your old motor painting thread - I'd say its a 272 /292 - not the older model. So party on....

Be sure the new dizzy settles clear down snug on the block - the oil pump drive is fairly short and you can end up with an engine that fires and operates - but no oil pressure......
Just leave the valve covers loosely in place when you try to start up - and then it will be an easy operation to set the valve lash. Y-blocks don't have pressurized lifters - just a bit of flow to the rocker shafts, so you won't have a mess like with a Chebbie.
Steve Metzger Tucson, Arizona