Eastman Kodak Co. will be looking for a single investment manager to manage $500 million in Kodak stock once the company buys it back from investors. The contribution is part of a $1 billion stock buyback plan announced earlier this month. A Kodak spokesman said the company hasn't set a deadline yet to hire a new manager. The spokesman would not speculate on the limitations the manager would have in selling the stock. This is the first contribution the company has made to the $5.3 billion fund since 1982. The contribution puts the fund just under the 10% stock limit pension funds are allowed to hold in company securities; Kodak's pension fund does not hold any other company stock, the spokesman said. Board members of the $250 million Oklahoma Law Enforcement Retirement System, Oklahoma City, have asked the fund's consultant - DeMarche Associates - to further analyze TCW Group. The board will discuss the fund's TCW portfolio at its Nov. 16 meeting. The board met with TCW officials last week to discuss the firm's performance since being hired in September 1993 to manage a $25 million bond portfolio. A spokesman for the fund, however, said recent performance has been good; he said TCW is up 14.4% year to date, compared with 13.62% for the Salomon Broad Bond index. John C. ``Jack'' Bogle, chairman and CEO of the Vanguard Group, has entered a hospital to receive cardiac treatment and await a heart transplant. Mr. Bogle, 66, has been undergoing care for a congenital heart defect for more than 30 years and decided to pursue a transplant based on the recommendations of cardiologists. He entered the hospital Oct. 19 for preliminary testing and was found to be a suitable candidate for transplant. The waiting period to receive a transplant is indeterminate and could be several months or more. Weiss Peck & Greer is reorganizing its marketing efforts, giving additional sales and client service duties to its top marketers. The firm has promoted Maureen Beshar from director of fixed-income marketing and client service to a new post as director of marketing. Principal Samuel H. Armacost will take on additional responsibilities as principal in charge of sales and marketing. Dennis D. Spice, former executive director of the State Universities Retirement System of Illinois, formed Institutional Advisors, a firm to consult to small pension funds and investment managers. Mr. Spice will target corporations, institutions, foundations and endowments with assets of $10 million to $100 million, offering investment policy and asset allocation consulting, according to a prepared statement. In addition, Mr. Spice will offer marketing and client services to emerging and established money management firms. Mr. Spice resigned earlier this year from Illinois SURS following a controversy over his compensation and spending practices there.