When reassembly is begun use a quality assembly lube on bearing surface parts !
Be certain to clean all your oil passage points with a chemical solvent as well as blown clear with compressed air prior to assembly to component parts!
check all mating surfaces are burr free and file off any interference points !
if the engine is at the machine shop request that all threaded holes be cleaned out of debris with proper bottoming taps.Have the machine shop check head for flatness and have the head valve seats reseated to coresponding valve.Use new valve guides and springs !If you are going with another cam for valve train have the shop check the bore the cam is to fit in. May need to be fitted in. Is the machine shop going to fit the crank up for you? Typically it is a good practice to have the crank ground and polished and then have the shop fit the crank up to insure the bearing package is a good fit on journals and caps. Someone said use plastigage and they are right and the shop doing the crank work will know the procedure .
you may want to consider to have the intake/exhaust mainfold bead blasted intenally to clean up any loose rust. I had mine vibratory finished as well with a stagged cermaic media to polish the ports so engine would breathe easily.
With the investment of shop work put a new oil pump in the engine. Oil PSI is a wonderfull thing.Use good gaskets not cheap ones. When reassembly is done then always fit the componets togther lossely first do not torque or apply sealants until you have checked the fit first, do not force things together.My volvos I worked on always seem to place the oil filter right by the hot exhaust mainfold. You can purchase a kit to put the filter on the fender or firewall and single or double stage filter the oil. I like clean oil in my engine. Ask the machine shop about the run in procedure they recommend so you do not void there policy. Hopefully they will have somthing in writing for you with there letter head a fixed.
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