First off it is not the starter solenoid, it does control the ignition, but the solenoid on all older chevys is on the starter itself. Take the part to any auto parts store, I use O'Reilly Auto Parts, they will have that fuse block/relay setup. I had to replace it on my 87 454.
Berniece & Russell with LilBit a Netherland Dwarf rabbit
1987 Southwind, 1995 Ford F150 Supercab 4X4 toad
Life in the fast lane? No thanks! We will stop and smell the flowers at every chance.