You're not gonna get advice from anybody with any more experience than Tom & Jim. They know their stuff so you're in good hands there.
Thank you Les for the compliment! I'm sure Tom appreciates it as much as I do!
jsindrof, when you start pouring these molds, be sure to get them plenty hot enough, like close to the lead melting point hot (550 to 620 degrees F) and keep them hot. Different molds pour well at various temps, but generally you need them to be very hot. You don't need to check the mold temp, as it's only important that you get good pours, but some folks do check as a reference for where the mold temp needs to be.
Some folks will also tell you to crank up the temp on the lead, and I disagree. That's attempting to compensate for the mold not being hot enough, and as long as the lead is molten, it will pour. When you get lead hotter than it needs to be, you get more oxidation, and it takes more energy so costs you more. Plus, with cranking up the heat, your melting equipment has more wear & tear, so may need more maintenance or replacement sooner.
A lot of folks think they have a mold hot, when it's not as hot as it should be. Collins molds, since they have more mass to them take longer to heat up if you go that route. Having the mold very hot helps with most pouring problems.