I may invest in a valve spring replacement tool. I would like one that can replace the springs with the engine(340:shaft mount)in the car. What do you recommend? I have seen some from $50 all the way up to $300. I want one that is safe and durable.
I found the attached on the Mancini websight. Is it a decent one to use?

Thank you.

7829011-Proform67460.jpg (54 downloads)

1970 YO7 A66 [Canadian Export] F8 Challenger
340 (Currently in shop for stroker assy.)