well... i'd recommend finding a GOOD shop and take a list of what ya want done. save the money and do it all at once. there's lotsa procedures you'd prolly like ta have done and not all procedures are done in the same department of the shop... so there's scheduling involved. ya start taking in and out and in and out the engine from the shop for work and it's gonna take a billion years ta get done. i'd say, do it all at once and let the shop do ya up and get'r done for ya.
i worked for quite a few years in a shop and scheduling was my biggest job. heads, cranks, block work, balancing, rod work... you name it we did it all and getting it all ta come together at one time took a lot of work at times juggling tickets... we prided ourselves on doing the best we could do and we all worked together for the common goals. quality machine work with a reasonable timeframe.
when a guy came in with one item, it wasn't really scheduled, it was stuck in line first come first serve, but components were scheduled ta be completed together... took less time doing lots then littles... if that makes sense.
hope i helped.