If the OP is doing the final assembly then the price is about right.
I just got some machining done, and I get a trade price, which included a re-bore +0.020", a flywheel lightened, fitted valve seat inserts and a valve seat cut, a crank micro-polish, a full dynamic balance, the block deck skimmed and the head skimmed, the valve seats machined down to get the correct fitted length and a full chemical clean. Total cost was just on £1000 which I think is reasonable. Parts for the full engine build were around £800 which included a new and better cam, new valves, oil pump, clutch, in fact everything new or reconditioned properly.
GuessWorks did the box (lovely job, John) and I don't know what he charged for the super job he did.
With the gas-flowing of the head, the trial builds, the painting of the block and other parts, accurate cam timing, plus the complete assembly including carb and distributor re-build total labour hours were just over 40.
If the OP is not doing the assembly, then it is right to ask what sort of job he will be getting for the quoted price.