Advice on camshaft for a 318, please.

I need some advice. Last summer I put a 318/360 Edelbrock Performer with a 600 cfm Holley and headers on my 318 engine. It is a little sluggish and I am pretty sure that is because I did not change the camshaft. The engine was bored over .030 as a stock rebuild by the previous owner with no intentions of performance enhancement. I do not want to get into switching heads and was hoping the camshaft change would help.
I was told a stock 340 camshaft would be a reasonable exchange in this case. Can anyone advise?
Oh, I still have stock igntion and distributor. I would expect electronic is advised?
And if there is any other adjustment you would consider doing on the engine let me know.
Thanks Greg - 69cudaownr
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