Just some thoughts.

1) No idea what pistons are in it so who knows what the CR is
2) Cam seems to be around the old DC 509 cam or the RB SSH-44 which are stout street cams probably best behind a stick on the street
3) The intake has got to go
4) Any time I have gotten involved with a rebuilt/overhauled/remanufactured engine that has sat for God knows how long in God knows where, disassembly is a good idea
5) This HP topic came up at one of our car club meetings and the consensus was that for a comfortable, pleasant street car. abut 500 hp is all that you really want